Grate



(No Model.)

HQRIGHARDS.

GRATE.

No. 510,547. Patented Dec. .12, 1893.

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To all whom it may concern:

'- ford, in the county of Hartford and State of 'of which the following is a specification.

- plates of the upper and lower grate-floors shall hand in Fig. 2.

UNITED STATES A FRANCIS H. RICHARDS, OF HARTFORD,

CONNECTICUT, ASSIGNOR 'ro ECKLEY B. COXE, OF DRIFTON, PENNSYLVANIA.

G RATE.

SPECIFICATION forming part of Letters Patent No. 510,547,dated December 12, 1893. Application filed July 10, 1893- Serial No. 480,008. (No model.)

Be it known that I, FRANCIS H. RICHARDS, a citizen of the United States, residing at Hart- Gonnecticut, have invented certain new and useful Improvements in Grates for Furnaces,

This invention relates to grates or furnacefloors for traveling-grate furnaces; the object being to furnish an improved double-floor traveling-grate especially adapted for burning the finer sizes of coal, and in which the be separately supported.

In the drawings accompanying and forming a part of this specification, Figure 1 is a plan View of a portion of a traveling grate embodying my present invention. Fig. 2 is a vertical longitudinal section on the line a a'of Fig. 1. Fig.3 is an edge View of an upper-' floor plate or section, as seen from the left- Similar characters designate like parts in all the figures.

My present improvements are specially designed for use in that class of furnaces described and claimed in the Letters Patent No. 499,716, granted to Eckley B. Coxe, June 20, 1893, and are in part in the-nature of an improvement on the double-plate furnace-floor describedin the applicationof said Ooxe, Se rial No. 477,264, filed June 12, 1893, to which I have permission to refer. V

In the drawings only a portion of an endless traveling grate is shown; said portion corresponding to the left-hand portion of the endless grate shown in the aforesaid Letters Patent No. 499,716.

My improved grate or furnace-floor being of the double-floor class referred to, comprises two sets of'grate-sections or floor-plates, one set constituting the upper-floor and the other set constituting the lower-floor of the grate. By the terms upper and lower as here used, I refer, of course, to the plates of the upper run, designated by G in Fig. 2. The lower run of the endless grate 1s deslgnated by G, but, being used only for returning the grate-sections to the beginning of the porting-beams; but this is not a feature of my upper run, may'for the purposes of this description be neglected.

As a means for carrying the beams and plates of the furnace-floor,I provide two or more carrying-chains, 2 and 4, which are carried and operated by chain-wheels, 3 and 5, after the manner more fully described in the aforesaid application, Serial No. 477,264. Said chains consist of successive pivoted links suitablyconstructed forengagingthe chain-wheels whereby the chains are driven. The alternate links B and B of the chain (see Fig. 2) carry the upper-floor beams N, while the intermediate links carry the lower-floor beams. On their outer edges, remote from the carrying chains, the several beams described (which, as shown, are set edgewise to said chains) are provided with plates constituting the two floors of the traveling grate. The upper-floor plates, designated by D, are shown removably fixed to the outer edges of the alternate beams N, and form a substantially continuous grate or furnace-floor, being supported in substantial alignment with each other. These upper-floor plates are shown perforated with numerous openings, 7, for the upward passage of the air for burning the fuel to be carried on the grate. Said upper plates are also shown of relatively shortlength in the direction of the length of their suppresent invention, it being described in the aforesaid applicationof Ec'kley B. Ooxe. The lower-floor beams E are supported on alternate links of the chains intermediate to the upper-floor beams, and on their outer edges, remote from said chains, are provided with the lower-floor plates H, which stand underneath the aforesaid upper-floor plates, with an air-space, S, (Fig. 2,) between said plates. The lower plates H are shown formed integral with their supporting-beams E, and, as more fully shown in Fig. 1, have formed therein slots, 8, intermediate, in the direction of the length of the beams, to the said openings 7 of the upper-floor plates.

As a means for removably securing the upper plates D in place on the beam N, said plates are shown provided with the dependy o I ing flange 9, which is set against one side of the beam as illustrated in Fig. 2, said flange being slotted at 10, and recessed around the end of said slot at 12 (see Fig. 3) for receiving the shoulder of the bolt 14:. By means of this construction, on unscrewing the bolt a short distance the plate may be lifted directly upward from the beam, leaving the bolt in the beam. On the passage of the chains and the beams around the chainwheels, as best shown in Fig. 2, the beams, by reason of their considerable projection outside of the chains, are widely separated at their outer edges, thereby withdrawing the upper and lower floor-plates the one from over the other, for breaking up and discharging the ashes and cinder from all of the plates. The action of the upper and lower plates on the separation of the same as described, serves to break up any slag or like obstruction formed between the plates during the movement of these along the upper run of the endless grate.

One of the upper-floorbeams, together with the floor-plate or plates thereon, constitutes a floor-section. The upper-floor section is shown having therein air-passage openings, 7, arranged in rows transversely of the floorsection; and the intermediate lower-floor section or plate is shown having therein air-passage openings, 8, extending to the edge of said plate and located intermediate to the openings of the upper-floor section; this is for the purpose of properly supporting the fine fuel which may pass down through the upper-floor openings, and at the same time provide for the freeing of the lower plate of any accumulation of ashes or cinders when the fioonplates are opened and closed as they are carried around the chain-wheels at the end of their circuit. The openings 8 extending to the edge of the lower plate, when the lower plate is turned over, the ashes and cinder will slide off unobstructed.

Having thus described my invention, I claim- 1. In a grate of the class specified, the combination with alternating upper-floor and lower-floor beams, of floor-plates on the upperfloor beams and forming a substantially continuous grate or furnace-floor, and fuel-supporting plates on the alternate beams and under the upper-floor, substantially as described.

2. In a grate of the class specified, the combination with carrying-chains consisting of successive pivoted links, and with chainwheels for carrying the chains, of a series of perforated upper-floor plates supported on alternate links of the chains in alignment with each other and remote from the chains, and lower-floor plates supported underneath said upper-floor plates and carried by chain-links intermediate to those carrying the plates of the upper-floor, whereby the floor-plates are separated on the passage of the same around the chain-wheels, substantially as described.

3. In a grate of the class specitied,the com bination with carrying-chains and means for actuating the same, of alternate upper-floor and lower-floor beams set ed gewise to the carrying -chains and provided on their outer edges, remote from said chains,with overlapping plates constituting the upper and lower floors of the grateisubstantially as described.

4. In a grate of the class specified, the combination with successive upper-floor plates having therein air-passage openings, and with means for carrying, opening and closing said plates, substantially as described, of separate lower-floor plates carried intermediate to the upper-floor plates for supporting the fuel, substantially as described. 5. In agrate of the class specified, the com bination with successive upper-floor-sections set side by side and having air-passage openings arranged in rows transversely thereof, and with means for carrying, opening and closing the sections substantially as described, of separate lower-floor plates carried intermediate to and independently of said sections underneath the same and having transverse openings extending to the edge thereof and located intermediate to the openings of the upper-fioor sections, substantially as described.

FRAN 018 H. RICHARDS.

Witnesses:

FRED. J. DOLE, JOHN L. EDWARDS, Jr. 

